There is no test, per se, as mentioned, excessive black smoke (unburned fuel) may indicate it is providing more fuel than the amount of air drawn in can deal with.
I've adjusted the one on the SD. That car would start in second gear and be sluggish until the turbo came online.
The benefit, if there not a problem elsewhere, is more performance and less mpg.
Some mention that if you don't have enough fuel being delivered, there is a timing problem.
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83 SD
84 CD
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